package com.gzgs.controller;

import com.gzgs.domain.SysLog;
import com.gzgs.service.SysLogService;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;
import java.util.Date;

/**
 * 日志处理切面类
 */

@Component
@Aspect
public class LogAop {
    @Autowired
    private HttpServletRequest request;

    @Autowired
    private SysLogService sysLogService;

    private Date visitTime;//开始时间
    private Class clazz;//访问的类名
    private Method method;//返回的方法

    //前置通知  主要是获取开始时间，执行的类是哪一个，执行的是哪一个方法
@Before("execution(* com.gzgs.controller.*.*(..)) &&!execution(* com.gzgs.controller.SysLogController.*(..))")
    public void doBefore(JoinPoint jp) throws NoSuchMethodException {
        visitTime=new Date();//开始访问时间
        clazz = jp.getTarget().getClass();
        String methodName=jp.getSignature().getName();//方法名
        Object [] args=jp.getArgs();//获取方法的参数
        if (args==null||args.length==0){
            method=clazz.getMethod(methodName);
        }else {
            //有参数，将参数存到数组里进行遍历
            Class[] classArgs=new Class[args.length];

            for (int i=0;i<args.length;i++){
                classArgs[i]=args[i].getClass();
            }
            method=clazz.getMethod(methodName,classArgs);//获取有参数的方法
        }
    }

    //后置通知
    @After("execution(* com.gzgs.controller.*.*(..))&&!execution(* com.gzgs.controller.SysLogController.*(..))")
    public void doAfter(JoinPoint jp) throws Exception {
        long time = new Date().getTime() - visitTime.getTime(); //获取访问的时长
        String url = "";
        //获取url
        if (clazz != null && method != null && clazz != LogAop.class) {
            //1.获取类上的@RequestMapping("/orders")
            RequestMapping classAnnotation = (RequestMapping) clazz.getAnnotation(RequestMapping.class);
            if (classAnnotation != null) {
                String[] classValue = classAnnotation.value();
                //2.获取方法上的@RequestMapping(xxx)
                RequestMapping methodAnnotation = method.getAnnotation(RequestMapping.class);
                if (methodAnnotation != null) {
                    String[] methodValue = methodAnnotation.value();
                    url = classValue[0] + methodValue[0];

                    //获取访问的ip
                    String ip = request.getRemoteAddr();

                    //获取当前操作的用户
                    SecurityContext context = SecurityContextHolder.getContext();//从上下文中获了当前登录的用户
                    User user = (User) context.getAuthentication().getPrincipal();
                    String username = user.getUsername();

                    //将日志相关信息封装到SysLog对象
                    SysLog sysLog = new SysLog();
                    sysLog.setExecutionTime(time); //执行时长
                    sysLog.setIp(ip);
                    sysLog.setMethod("[类名] " + clazz.getName() + "[方法名] " + method.getName());
                    sysLog.setUrl(url);
                    sysLog.setUsername(username);
                    sysLog.setVisitTime(visitTime);

                    //调用Service完成操作
                    sysLogService.save(sysLog);
                }
            }
        }

    }
}

